JP2014196705A - Hermetic rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic rotary compressor capable of relaxing a force for relatively moving a drive shaft in an axial direction and suppressing increases in noise and vibration if acceleration and higher pressure are intended while including a flexible structure cylinder for suppressing local wear of the drive shaft.SOLUTION: A hermetic rotary compressor 100 comprises: an upper bearing 1 and a lower bearing 2 forming a compression mechanism 101. The hermetic rotary compressor 100 comprises: an upper flexible structure 110 provided in the upper bearing 1, and including an upper flexible structure groove 13 opening to an upper bearing receiving seat surface 1a, formed in parallel to an upper bearing inner circumferential surface 1c, and having a circular cross-section; a circular upper flexible structure cylinder 12 formed between the upper bearing inner circumferential surface 1c and the upper flexible structure groove 13; and an upper flexible structure stepped portion 11 formed by causing an upper flexible structure end portion 12a to be located above the upper bearing receiving seat surface 1a over an entire periphery; and a lower flexible structure 120 similarly provided in the lower bearing 2, and including a lower flexible structure groove 23; a lower flexible structure cylinder 22; and a lower flexible structure stepped portion 21.

Description

  The present invention relates to a hermetic rotary compressor, and more particularly to a hermetic rotary compressor including a compression mechanism that compresses a fluid by eccentrically rotating a rolling piston disposed in a cylinder.

Conventionally, a hermetic rotary compressor has a configuration in which a compression mechanism that sucks refrigerant gas and compresses the sucked refrigerant and an electric mechanism that drives the compression mechanism are housed in a hermetic container.
The compression mechanism includes a cylinder that is a cylindrical body having a circular inner peripheral surface, a cylindrical rolling piston arranged in the cylinder, a drive shaft (crankshaft) that eccentrically rotates the rolling piston, and a cylinder A plurality of vanes arranged in a plurality of vane grooves formed to be movable forward and backward, and a drive shaft is rotatably supported, in close contact with both end faces of the cylinder, and between both end faces of the rolling piston and the vane An upper bearing (main bearing) and a lower bearing (sub bearing) that form a slight gap between the both end faces are provided.
The electric mechanism has a stator installed on the inner peripheral surface of the hermetic container and a rotor arranged inside the stator, and a drive shaft is fixed to the rotor.

That is, the volume of the space (hereinafter referred to as “compression chamber”) formed by the inner peripheral surface of the cylinder, the outer peripheral surface of the rolling piston, a pair of adjacent vanes, and the upper bearing and the lower bearing is the eccentricity of the rolling piston. The structure varies with rotation.
Therefore, when the rolling piston is eccentrically rotated by the electric mechanism, the compression mechanism sucks the refrigerant gas in the region where the volume is increased (rotation phase) and compresses the refrigerant gas in the region where the volume is reduced (rotation phase). The compressed refrigerant is discharged into the sealed container, and then supplied from the sealed container to an external device (for example, a refrigeration apparatus).

  Note that a multistage hermetic rotary compressor having a plurality of compression mechanisms has an intermediate partition plate disposed between adjacent compression mechanisms in place of the upper bearing or the lower bearing, and the compression mechanism disposed at the extreme end. Only the upper bearing or the lower bearing is arranged.

The hermetic rotary compressor as described above is driven when the compression mechanism compresses the refrigerant gas, because the compression load acts on the drive shaft and bends (deviation in a direction perpendicular to the axial direction). There is a possibility that local wear may occur in the upper and lower bearings due to the bending of the shaft.
For this reason, a hermetic rotary compressor in which a “flexible structure” that absorbs the deflection of the drive shaft is formed on at least one of the upper bearing and the lower bearing is disclosed (for example, see Patent Document 1).

JP 2004-124834 A (page 4-5, FIG. 4)

The “flexible structure” disclosed in Patent Document 1 is such that when the drive shaft (crankshaft) is bent and deformed, the bearing inner diameters of the upper bearing and the lower bearing are easily deformed minutely. That is, since a groove having a circular cross section (hereinafter referred to as “soft structure groove”) is formed at an end surface that contacts the cylinder at a position slightly away from the inner peripheral surfaces of the upper bearing and the lower bearing. A thin cylindrical portion (hereinafter referred to as “flexible structure cylinder”) is formed between the inner peripheral surfaces of the upper and lower bearings and the flexible structure groove.
Therefore, the flexible cylinder easily elastically deforms (elastically moves) in response to the bending deformation of the drive shaft, so that the compressive load acting on the inner peripheral surface of the flexible cylinder is relieved and local wear is suppressed. It has been.

However, recent sealed rotary compressors are required to have higher speeds and higher operating pressures. With higher speeds and higher pressures, closed rotary compressors discharge refrigerant gas compressed by a compression mechanism into sealed containers. Before and after, the amplitude of pressure pulsation in the compression chamber increases.
When the pressure pulsation in the compression chamber increases, the drive shaft (at least the eccentric portion to which the rolling piston is fixed) is pressed in the axial direction and relatively moved in the axial direction.
At this time, in order to enable the eccentric rotation of the rolling piston, a slight gap is formed between the lower surface of the upper bearing and the upper end surface of the rolling piston, and between the upper surface of the lower bearing and the lower end surface of the rolling piston. Since (clearance) is formed, a phenomenon occurs in which one gap is enlarged and the other gap is reduced.

Then, when a flexible cylinder is formed on at least one of the upper bearing and the lower bearing, the gap between the end surface of the flexible cylinder (the same surface as the lower end surface of the upper bearing or the upper end surface of the lower bearing) and the end surface of the rolling piston It becomes easy for the refrigerant gas to leak (flow) into the flexible structure groove through the enlarged gap. On the contrary, when the gap between the rolling piston and the end surface of the rolling piston is reduced, it is difficult to leak (flow out) from the flexible structure groove, and the refrigerant gas is further compressed. It occurs repeatedly.
For this reason, the pressure inside the flexible structure groove is an axial force acting on the bottom surface (ceiling surface) of the flexible structure groove. Therefore, when the pulsation increases, the force that relatively moves the drive shaft in the axial direction is strong. Therefore, there is a problem that noise from the main body of the hermetic rotary compressor increases and vibration of the main body increases.

  The present invention has been made to solve the above-described problems, and is a flexible structure for suppressing local wear of the drive shaft due to deflection of the drive shaft (deviation in a direction perpendicular to the rotation shaft). Provided is a hermetic rotary compressor that can reduce the increase in noise and vibration by relaxing the force to move the drive shaft in the axial direction when achieving high speed and high pressure while having a cylinder. There is.

  A hermetic rotary compressor according to the present invention includes a compression mechanism that is accommodated in a hermetic container, sucks fluid and compresses the sucked fluid, and an electric mechanism that drives the compression mechanism. A cylinder which is a cylindrical body having an inner peripheral surface having a circular cross section and end surfaces parallel to each other, a cylindrical rolling piston disposed in the cylinder, and an eccentric shaft portion to which the rolling piston is fixed. A drive shaft, an upper bearing and a lower bearing that rotatably support the drive shaft, and a plurality of vanes disposed in a plurality of vane grooves formed in the cylinder, the upper bearing being An upper bearing inner peripheral surface that rotatably supports the eccentric shaft portion of the drive shaft, and an upper end surface of the cylinder, and an upper end surface of the rolling piston and upper surfaces of the plurality of vanes. An upper bearing seat surface facing the surface, and the lower bearing is in close contact with a lower bearing inner peripheral surface that rotatably supports a lower side than the eccentric shaft portion of the drive shaft, and a lower end surface of the cylinder. A lower bearing seat surface facing a lower end surface of the rolling piston and a lower end surface of the plurality of vanes, an inner peripheral surface of the cylinder, an outer peripheral surface of the rolling piston, the plurality of vanes, and the upper A plurality of compression chambers, which are spaces formed by the bearing seat surface and the lower bearing seat surface, are formed, and the electric mechanism includes a stator installed on the inner peripheral surface of the hermetic container, and an interior of the stator. And a rotor fixed to the drive shaft, and when the electric mechanism rotates the drive shaft, the rolling piston rotates eccentrically, thereby the plurality of compression chambers. A hermetic rotary compressor whose volume varies, wherein the upper bearing sheet surface opens and is formed in parallel with the upper bearing inner peripheral surface, and the upper bearing inner peripheral surface has a circular cross-section soft structure groove. An upper flexible structure comprising a cylindrical upper flexible structure cylinder formed between the upper flexible groove and an upper internal pressure relief means for suppressing an increase in internal pressure of the upper flexible groove, and the lower bearing A cylindrical soft lower groove formed between the lower bearing inner peripheral surface and the lower flexible structure groove, which is open in the seat surface and formed in parallel with the lower bearing inner peripheral surface and having a circular cross section. It has at least one of the flexible structure which comprises a flexible structure cylinder and the lower internal pressure relief means which suppresses the increase in the internal pressure of this lower flexible structure groove | channel.

The hermetic rotary compressor according to the present invention includes an upper flexible structure including an upper internal pressure relief means for suppressing an increase in internal pressure of the upper flexible groove and a lower internal pressure relief means for suppressing an increase in internal pressure of the lower flexible structure groove. Therefore, the fluid that has flowed into the upper soft structure groove or the lower soft structure groove easily flows out of the upper soft structure groove or the lower soft structure groove.
Therefore, even if the amplitude of the pressure pulsation in the compression chamber increases due to higher speed or higher operating pressure, and the drive shaft moves relatively in the axial direction, the fluid can be easily removed from the upper flexible groove or the lower flexible groove. By flowing out, an increase in the internal pressure of the upper flexible structure groove or the lower flexible structure groove is suppressed.
Accordingly, the force for moving the drive shaft in the axial direction can be suppressed, and noise from the main body of the hermetic rotary compressor and increase in vibration of the main body can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing of the side view which shows the whole which illustrates typically the hermetic rotary compressor which concerns on Embodiment 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 schematically illustrates a hermetic rotary compressor according to a first embodiment of the present invention, in which (a) is a side sectional view showing a part, and (b) is an enlarged part. Sectional drawing of a side view. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 schematically illustrates a hermetic rotary compressor according to a second embodiment of the present invention, in which (a) is a side sectional view showing a part, and (b) is an enlarged part. Sectional drawing of a side view, (c) is a perspective view which extracts and shows a part. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 schematically illustrates a hermetic rotary compressor according to a third embodiment of the present invention, in which (a) is a side sectional view showing a part, and (b) is an enlarged part. Sectional drawing of a side view, (c) is a perspective view which extracts and shows a part. Sectional drawing of the side view which shows a part which illustrates typically the sealed rotary compressor which concerns on Embodiment 4 of this invention.

[Embodiment 1]
1 and 2 schematically illustrate a hermetic rotary compressor according to Embodiment 1 of the present invention. FIG. 1 is a cross-sectional side view showing the whole, and FIG. FIG. 2B is a cross-sectional view in side view showing a part, and FIG. In addition, since each figure is shown typically (a part is exaggerated), this invention is not limited to the shown form.

(Sealed rotary compressor)
In FIG. 1, the hermetic rotary compressor 100 has a configuration in which a compression mechanism 101 that compresses a refrigerant gas and an electric mechanism 102 that drives the compression mechanism 101 are incorporated in a hermetic container 9.
The electric mechanism 102 includes a stator 7 installed on the inner peripheral surface of the hermetic container 9 and a rotor 8 that is rotatably arranged inside the stator 7.
The compression mechanism 101 includes a cylinder 3 that is a cylindrical body having an inner peripheral surface having a circular cross section and end surfaces that are parallel to each other, a cylindrical rolling piston 5 disposed in the cylinder 3, and the rolling piston 5 fixed thereto. A drive shaft 4 having an eccentric shaft portion (not shown), an upper bearing 1 and a lower bearing 2 that rotatably support the drive shaft 4, and a plurality of vane grooves formed in the cylinder 3 are disposed so as to be able to advance and retract. A plurality of vanes 6.

(Compression chamber)
The upper bearing 1 is in close contact with the upper bearing inner peripheral surface 1c that rotatably supports the eccentric shaft portion of the drive shaft 4 and the upper end surface of the cylinder 3, and the upper end surface of the rolling piston 5 and a plurality of vanes 6 And an upper bearing sheet surface 1a that forms a slight gap opposite to the upper end surface. Similarly, the lower bearing 2 is in close contact with the lower bearing inner peripheral surface 2 c that rotatably supports the lower side of the eccentric shaft portion of the drive shaft 4 and the lower end surface of the cylinder 3, and the lower end surface of the rolling piston 5. And a lower bearing sheet surface 2a that is opposed to the lower end surfaces of the plurality of vanes 6 and forms a slight gap.
A plurality of spaces (hereinafter referred to as “compression chambers”) formed by the inner peripheral surface of the cylinder 3, the outer peripheral surface of the rolling piston 5, the plurality of vanes 6, and the upper bearing seat surface 1a and the lower bearing seat surface 2a. Is formed).

Accordingly, when the drive shaft 4 is rotated by the electric mechanism 102, the rolling piston 5 rotates eccentrically, so that the distance between the inner peripheral surface of the cylinder 3 and the outer peripheral surface of the rolling piston 5 varies, and the outer periphery of the rolling piston 5 is changed. The amount of protrusion from the cylinder 3 of the vane 6 whose tip slides on the surface varies. That is, paying attention to a specific compression chamber sandwiched between a specific pair of vanes 6, the volume of the specific compression chamber repeatedly increases and decreases due to the eccentric rotation of the rolling piston 5.
That is, when the volume of a specific compression chamber increases, the refrigerant is sucked into the specific compression chamber via the suction pipe 103, and when the volume of the compression chamber decreases, the sucked refrigerant is compressed, and again Before the increase, the liquid is discharged into the sealed container 9 via a discharge hole (not shown) formed in the upper bearing 1. The compressed refrigerant is supplied from the inside of the sealed container 9 to each facility using the compressed refrigerant via the discharge pipe 104. A discharge muffler 10 is installed on the upper bearing 1 so as to cover the discharge hole in order to reduce vibration or noise during discharge.

(Flexible structure step)
The upper bearing 1 has an upper flexible sheet groove 13 which is open to the upper bearing sheet surface 1a and is formed in parallel with the upper bearing inner peripheral surface 1c, and the upper bearing inner peripheral surface 1c and the upper flexible groove 13. And a cylindrical soft structure cylinder 12 formed between the two. The upper flexible structure end 12a, which is the end surface of the upper flexible structure cylinder 12, is positioned above the upper bearing sheet surface 1a over the entire circumference, so that the upper flexible structure end 12a and the upper bearing sheet surface 1a are located. The upper flexible structure level | step difference 11 is formed between these. The structure including the upper flexible structure groove 13, the upper flexible structure cylinder 12, and the upper flexible structure step 11 is referred to as “upper flexible structure 110”.
Similarly, the lower bearing 2 has an opening in the lower bearing sheet surface 2a, a circular soft groove 23 having a circular cross section formed in parallel with the lower bearing inner peripheral surface 2c, and the lower bearing inner peripheral surface 2c and the lower soft structure. A cylindrical soft structure cylinder 22 formed between the grooves 23 is formed. And the lower flexible structure end 22a which is an end surface of the lower flexible structure cylinder 22 is located below the lower bearing sheet surface 2a over the entire circumference, so that the lower flexible structure end 22a and the lower bearing sheet surface 2a are located. An inferior soft structure step 21 is formed between them. A structure including the lower flexible structure groove 23, the lower flexible structure cylinder 22, and the lower flexible structure step 21 is referred to as a “lower flexible structure 120”.

  Accordingly, the hermetic rotary compressor 100 has the upper flexible structure step 11 as the upper internal pressure relief means and the lower flexible structure step 21 as the lower internal pressure relief means. The refrigerant that has flowed into 23 is likely to flow out of the upper flexible groove 13 and the lower flexible groove 23. Therefore, even if the amplitude of the pressure pulsation in the compression chamber is increased due to the increase in speed or the operating pressure, and the drive shaft 4 is relatively moved in the axial direction, the refrigerant is in the upper flexible groove 13 and the lower flexible groove 23. By flowing out easily from the above, an increase in internal pressure of the upper flexible structure groove 13 and the lower flexible structure groove 23 is suppressed. Therefore, the force that relatively moves the drive shaft 4 in the axial direction is suppressed, and an increase in noise and vibration from the sealed container 9 of the hermetic rotary compressor 100 can be suppressed.

In the above, the upper flexible structure step 11 is formed over the entire circumference of the upper flexible structure end portion 12a, and the lower flexible structure step 21 is formed over the entire circumference of the lower flexible structure end portion 22a. The present invention is not limited to this, and a partial upper flexible structure step 11 may be formed in one or a plurality of locations on the upper flexible structure end 12a, or a partial lower structure may be formed on the lower flexible structure end 22a. The flexible structure step 21 may be formed in one or a plurality of places.
Furthermore, the upper flexible structure 110 and the lower flexible structure 120 are formed on both the upper bearing 1 and the lower bearing 2, respectively, but the present invention is not limited to this, and the upper bearing 1 and the lower bearing are not limited thereto. The upper flexible structure 110 or the lower flexible structure 120 may be formed on at least one of the two.

[Embodiment 2]
FIGS. 3A to 3C schematically illustrate a hermetic rotary compressor according to Embodiment 2 of the present invention, in which FIG. (B) is sectional drawing of the side view which expands and shows a part, (c) is a perspective view which extracts and shows a part. In addition, the same code | symbol is attached | subjected to the part which is the same as that of Embodiment 1, or an equivalent part, and one part description is abbreviate | omitted.

(Bearing inner peripheral groove and flexible structure communication groove)
3 (a) to 3 (c), the hermetic rotary compressor 200 is disposed on the upper bearing inner peripheral surface 1c of the upper bearing 1 from the upper bearing sheet surface 1a over the entire length (overall height) of the upper end surface 1b. The inner circumferential groove 14 of the bearing is formed, the upper flexible structure communication groove 15 that is a partial step is formed in the upper flexible structure end 12a, and the upper bearing inner circumferential groove 14 and the upper flexible structure communication groove 15 communicate with each other. Yes. The structure including the upper flexible structure groove 13, the upper flexible structure cylinder 12, the upper bearing inner circumferential groove 14, and the upper flexible structure communication groove 15 is referred to as “upper flexible structure 210”.
Similarly, in the hermetic rotary compressor 200, the lower bearing inner peripheral groove 24 is formed in the lower bearing inner peripheral surface 2c of the lower bearing 2 over the entire length (total height) from the lower bearing sheet surface 2a to the lower end surface 2b. In addition, a lower flexible structure communication groove 25 that is a partial step is formed in the lower flexible structure end 22a, and the lower bearing inner circumferential groove 24 and the lower flexible structure communication groove 25 communicate with each other. The structure including the lower flexible structure groove 23, the lower flexible structure cylinder 22, the lower bearing inner circumferential groove 24, and the lower flexible structure communication groove 25 is referred to as a “lower flexible structure 220”.

Therefore, the hermetic rotary compressor 200 has the upper flexible structure 210 and the lower flexible structure 220, and the upper bearing inner circumferential groove 14 and the upper flexible structure communication groove 15 as upper internal pressure releasing means, and the lower internal pressure releasing means. The lower bearing inner circumferential groove 24 and the lower flexible structure communication groove 25 are formed. That is, the refrigerant that has flowed into the upper flexible structure groove 13 and the lower flexible structure groove 23 easily flows out from the upper flexible structure groove 13 and the lower flexible structure groove 23 into the sealed container 9.
Therefore, even if the amplitude of the pressure pulsation in the compression chamber is increased due to the increase in speed or the operating pressure, and the drive shaft 4 is relatively moved in the axial direction, the refrigerant is in the upper flexible groove 13 and the lower flexible groove 23. More easily spills from. That is, since the increase in the internal pressure of the upper flexible structure groove 13 and the lower flexible structure groove 23 is further suppressed, the force for moving the drive shaft 4 in the axial direction is further suppressed, and the sealed container 9 of the hermetic rotary compressor 100 is further suppressed. The increase in noise and vibration from can be suppressed.

In the above, one upper bearing inner circumferential groove 14 and one lower bearing inner circumferential groove 24 communicate with the upper flexible structure communicating groove 15 and the lower flexible structure communicating groove 25 formed in one place, The present invention is not limited to this, and the upper flexible structure communication groove 15 and the lower flexible structure communication groove 25 may be formed at two or more locations, and the upper flexible structure communication groove 15 and the lower flexible structure communication groove 25 may be formed. 25, two or more upper bearing inner circumferential grooves 14 and lower bearing inner circumferential grooves 24 may be communicated with each other.
Furthermore, instead of the upper flexible structure communication groove 15 and the lower flexible structure communication groove 25, an upper flexible structure step 11 and a lower flexible structure step 21 (see Embodiment 1) may be provided.
Further, the hermetic rotary compressor 200 has both the upper flexible structure 210 and the lower flexible structure 220, but the present invention is not limited to this, and may have only one of them. Good.

[Embodiment 3]
FIGS. 4A to 4C schematically illustrate a hermetic rotary compressor according to Embodiment 3 of the present invention, and FIG. 4A is a side sectional view showing a part thereof, (B) is sectional drawing of the side view which expands and shows a part, (c) is a perspective view which extracts and shows a part. In addition, the same code | symbol is attached | subjected to the part which is the same as that of Embodiment 2, or an equivalent part, and one part description is abbreviate | omitted.

(Bearing inner circumferential groove and flexible structure communication hole)
4A to 4C, the hermetic rotary compressor 300 includes an upper flexible communication groove 15 and a lower flexible communication groove 25 formed in the hermetic rotary compressor 200 described in the second embodiment. Are changed to upper flexible structure communication holes 16 and lower flexible structure communication holes 26, respectively.
That is, the upper bearing 1 is formed with an upper flexible structure communication hole 16 penetrating the upper flexible structure cylinder 12, and the upper flexible structure groove 13, the upper flexible structure cylinder 12, the upper bearing inner circumferential groove 14, and the upper flexible structure communication hole. A “soft structure 310” that is a structure having 16 is formed. In addition, a lower flexible structure communication hole 26 penetrating the lower flexible structure cylinder 22 is formed in the lower bearing 2, and a lower flexible structure groove 23, a lower flexible structure cylinder 22, a lower bearing inner circumferential groove 24, and a lower flexible structure communication hole are formed. A “underflexible structure 320” that is a structure having 26 is formed.

  Then, the upper flexible structure end portion 12a is in the same plane as the upper bearing sheet surface 1a over the entire length, and the lower flexible structure end portion 22a is in the same plane as the lower bearing sheet surface 2a over the entire length, The refrigerant is difficult to flow into the upper flexible structure groove 13 and the lower flexible structure groove 23 from the compression chamber, and once the refrigerant flows, the upper flexible structure communication hole 16 and the upper bearing inner peripheral groove 14 are communicated with the lower flexible structure communication hole. It is easy to flow out from the upper flexible groove 13 and the lower flexible groove 23 into the sealed container 9 via the hole 26 and the lower bearing inner circumferential groove 24, respectively.

Therefore, the hermetic rotary compressor 300 includes the upper flexible communication hole 16 and the upper bearing inner circumferential groove 14 as upper internal pressure relief means, and the lower flexible structure communication hole 26 and the lower bearing inner circumferential groove 24 as lower inner pressure relief means. Therefore, even when the drive shaft 4 is relatively moved in the axial direction due to the increase in the pressure pulsation amplitude in the compression chamber due to the increase in speed or the increase in the operating pressure, the flexible structure groove 13 and While the amount of the refrigerant flowing into the lower flexible structure groove is suppressed to a small amount, the refrigerant that has once flowed in easily flows out from the upper flexible structure groove 13 and the lower flexible structure groove 23 into the sealed container 9. Therefore, the increase in the internal pressure of the upper flexible structure groove 13 and the lower flexible structure groove 23 is further suppressed, so that the force for moving the drive shaft 4 in the axial direction is further suppressed, and the sealed container 9 of the hermetic rotary compressor 100 is further suppressed. The increase in noise and vibration from can be suppressed.
The number and arrangement of the upper flexible structure communication holes 16 and the lower flexible structure communication holes 26 may be modified in accordance with the upper flexible structure communication grooves 15 and the lower flexible structure communication holes 25 (see Embodiment 2). .
Further, the hermetic rotary compressor 300 has both the upper flexible structure 310 and the lower flexible structure 320. However, the present invention is not limited to this, and may have only one of them. Good.

[Embodiment 4]
FIG. 5 is a side sectional view showing a part of the hermetic rotary compressor according to the fourth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the part which is the same as that of Embodiment 1, or an equivalent part, and one part description is abbreviate | omitted.

(Bearing hole)
In FIG. 5, the hermetic rotary compressor 400 includes the upper flexible communication hole 16 and the lower flexible communication hole 26 formed in the hermetic rotary compressor 300 described in the third embodiment, respectively. And the lower bearing communication hole 27 is changed.
That is, an upper bearing communication hole 17 that is parallel to the upper bearing sheet surface 1 a and opens on the outer peripheral surface 1 d of the flange portion of the upper bearing 1 and communicates with the upper flexible groove 13 is formed. A “upper flexible structure 410” that is a structure including the structural cylinder 12, the upper bearing inner circumferential groove 14, and the upper bearing communication hole 17 is formed. Similarly, a lower bearing communication hole 27 that is parallel to the lower bearing sheet surface 2 a and that opens in the outer peripheral surface 2 d of the flange portion of the lower bearing 2 and communicates with the lower flexible structure groove 23 is formed. In addition, a “lower flexible structure 420” which is a structure including the lower flexible structure cylinder 22, the lower bearing inner circumferential groove 24, and the lower bearing communication hole 27 is formed.

  At this time, the upper flexible structure end portion 12a is in the same plane as the upper bearing sheet surface 1a over the entire length, and the lower flexible structure end portion 22a is in the same plane as the lower bearing sheet surface 2a over the entire length. The refrigerant hardly flows into the upper flexible structure groove 13 and the lower flexible structure groove 23 from the compression chamber, and the once-flowed refrigerant passes through the upper bearing communication hole 17 and the lower bearing communication hole 27, respectively. The flexible structure groove 13 and the lower flexible structure groove 23 easily flow out into the sealed container 9.

  Accordingly, the hermetic rotary compressor 400 includes the upper bearing communication hole 17 as the upper internal pressure relief means and the lower bearing communication hole 27 as the lower internal pressure relief means. As a result, the pressure pulsation amplitude in the compression chamber increases, and even when the drive shaft 4 moves relative to the axial direction, the amount of refrigerant flowing into the upper flexible structure groove 13 and the lower flexible structure groove is suppressed to a small amount. The refrigerant once flowing in easily flows out into the sealed container 9 from the upper flexible structure groove 13 and the lower flexible structure groove 23. Therefore, the increase in the internal pressure of the upper flexible structure groove 13 and the lower flexible structure groove 23 is further suppressed, so that the force for moving the drive shaft 4 in the axial direction is further suppressed, and the sealed container 9 of the hermetic rotary compressor 100 is further suppressed. The increase in noise and vibration from can be suppressed.

The number and size of the upper bearing communication hole 17 and the lower bearing communication hole 27 are not limited and may be plural. Further, the opening positions of the upper bearing communication hole 17 and the lower bearing communication hole 27 on the closed container 9 side are not limited to the outer peripheral surface 1d of the flange portion and the outer peripheral surface 2d of the flange portion. It may be the surface 1e and the outer peripheral surface 2e of the cylindrical portion, or may be the upper surface 1f of the flange portion and the lower surface 2f of the flange portion. Furthermore, the upper bearing communication hole 17 and the lower bearing communication hole 27 may be inclined rather than parallel to the upper bearing sheet surface 1a and the lower bearing sheet surface 2a, respectively.
In the present invention, the outer peripheral surface 1d, the outer peripheral surface 1e, and the upper surface 1f are collectively referred to as an “outer surface”, and the outer peripheral surface 2d, the outer peripheral surface 2e, and the lower surface 2f are collectively referred to as an “outer surface”.

(Other embodiments)
Although the above description has been given of the case where one cylinder 3 is provided, the present invention is not limited to this, and a plurality of cylinders 3 may be provided. At this time, the upper bearing 1 and the intermediate partition plate are in close contact with the upper end surface and the lower end surface of the cylinder 3 disposed at the uppermost stage, respectively, and the lower end surface and the upper end surface of the cylinder 3 disposed at the lowermost stage are The bearing 2 and the intermediate partition plate are in close contact with each other. When three or more cylinders 3 are provided, the intermediate partition plates are in close contact with the upper end surface and the lower end surface of the cylinder 3 disposed in the middle except the uppermost and lowermost cylinders 3. (Both not shown).

  1 upper bearing, 1a seat surface, 1b upper end surface, 1c inner peripheral surface, 1d outer peripheral surface, 1e outer peripheral surface, 1f upper surface, 2a seat surface, 2b lower end surface, 2c inner peripheral surface, 2d outer peripheral surface, 2e Outer peripheral surface, 2f bottom surface, 3 cylinder, 4 drive shaft, 5 rolling piston, 6 vane, 7 stator, 8 rotor, 9 sealed container, 10 discharge muffler, 11 flexible structure step, 12 flexible structure cylinder, 12a Flexible structure end, 13 Upper flexible structure groove, 14 Upper bearing inner circumferential groove, 15 Upper flexible structure communication groove, 16 Upper flexible structure communication hole, 17 Upper bearing communication hole, 21 Lower flexible structure step, 22 Lower flexible structure cylinder, 22a Lower flexible structure end, 23 Lower flexible structure groove, 24 Lower bearing inner circumferential groove, 25 Lower flexible structure communication groove, 26 Lower flexible structure communication hole, 27 Lower bearing communication hole, 100 Hermetic rotary compressor (embodiment) 1) DESCRIPTION OF SYMBOLS 101 Compression mechanism, 102 Electric mechanism, 103 Intake pipe, 104 Discharge pipe, 110 Upper flexible structure (Embodiment 1), 120 Lower flexible structure (Embodiment 1), 200 Hermetic rotary compressor (Embodiment 2) 210 Upper soft structure (Embodiment 2), 220 Lower soft structure (Embodiment 2), 300 Hermetic rotary compressor (Embodiment 3), 310 Upper soft structure (Embodiment 3), 320 Lower soft structure Structure (Embodiment 3), 400 Hermetic rotary compressor (Embodiment 4), 410 Upper flexible structure (Embodiment 4), 420 Lower flexible structure (Embodiment 4)

Claims (6)

A compression mechanism that is housed in an airtight container and sucks the fluid and compresses the sucked fluid; and an electric mechanism that drives the compression mechanism,
The compression mechanism includes a cylinder that is a cylindrical body having a circular inner peripheral surface and end faces parallel to each other, a cylindrical rolling piston disposed in the cylinder, and an eccentric shaft to which the rolling piston is fixed. A drive shaft having a portion, an upper bearing and a lower bearing that rotatably support the drive shaft, and a plurality of vanes disposed in a plurality of vane grooves formed in the cylinder,
The upper bearing is in close contact with an upper bearing inner peripheral surface rotatably supported above the eccentric shaft portion of the drive shaft, an upper end surface of the cylinder, and an upper end surface of the rolling piston and the plurality of vanes. An upper bearing sheet surface facing the upper end surface of
The lower bearing is in close contact with an inner peripheral surface of a lower bearing that rotatably supports a portion below the eccentric shaft portion of the drive shaft, and a lower end surface of the cylinder, and a lower end surface of the rolling piston and the plurality of vanes A lower bearing sheet surface facing the lower end surface of
A plurality of compression chambers, which are spaces formed by the inner peripheral surface of the cylinder, the outer peripheral surface of the rolling piston, the plurality of vanes, and the upper and lower bearing seat surfaces, are formed,
The electric mechanism includes a stator installed on an inner peripheral surface of the sealed container, and a rotor disposed inside the stator and fixed to the drive shaft,
When the electric mechanism rotates the drive shaft, the rolling piston eccentrically rotates, whereby the volume of the plurality of compression chambers varies, respectively,
An upper flexible sheet groove having a circular cross section formed in the upper bearing sheet surface and parallel to the inner circumferential surface of the upper bearing, and a cylinder formed between the inner circumferential surface of the upper bearing and the upper flexible groove A soft structure comprising a cylindrical soft structure cylinder and an internal pressure relief means for suppressing an increase in internal pressure of the soft structure groove;
And an opening in the lower bearing sheet surface and formed between the lower bearing inner peripheral surface and the lower flexible structure groove having a circular cross section formed parallel to the lower bearing inner peripheral surface. A hermetic rotary compressor having at least one of a lower flexible structure including a cylindrical lower flexible structure cylinder and a lower internal pressure relief means for suppressing an increase in internal pressure of the lower flexible groove. The upper internal pressure relief means is formed between the end portion of the upper flexible structure and the upper bearing sheet surface by being positioned above the upper bearing sheet surface, and is an end surface of the upper flexible structure cylinder. A flexible structure step formed on the entire circumference of the flexible structure end or a flexible structure communication groove formed on a part of the edge of the flexible structure,
The lower internal pressure relief means is formed between the end portion of the lower flexible structure and the lower bearing sheet surface by being positioned above the lower bearing sheet surface, and is an end surface of the lower flexible structure cylinder. 2. The hermetically sealed rotation according to claim 1, which is a lower flexible structure step formed on the entire circumference of the flexible structure end portion or a lower flexible structure communication groove formed on a part of the lower flexible structure end portion. Compressor. When the upper flexible structure is provided, the upper bearing inner peripheral surface opens to the upper end surface of the upper bearing and communicates with the upper flexible structure groove via the upper flexible structure step or the upper flexible structure communication groove. An upper bearing inner circumferential groove is formed,
Alternatively, in the case of having the lower flexible structure, the lower flexible structure groove opens to the inner peripheral surface of the lower bearing at the lower end surface of the lower bearing and passes through the lower flexible structure step or the lower flexible structure communication groove. 3. A hermetic rotary compressor according to claim 2, further comprising an inner peripheral groove formed in the lower bearing that communicates with the inner peripheral groove. The upper internal pressure relief means is formed in an upper flexible structure through hole that penetrates an upper bearing cylinder that forms the upper bearing, and an upper peripheral surface of the upper bearing, and opens to an upper end surface of the upper bearing. An upper bearing inner circumferential groove communicating with the upper flexible structure groove via a through hole,
The lower internal pressure relief means is formed in a lower flexible structure through hole that penetrates a lower bearing cylinder that forms the lower bearing, and an inner peripheral surface of the lower bearing, and opens at a lower end surface of the lower bearing, and the lower flexible structure 2. The hermetic rotary compressor according to claim 1, wherein the inner rotary groove is a lower bearing inner peripheral groove communicating with the lower flexible structure groove via a through hole. The upper internal pressure relief means is an upper bearing communication hole that opens to the outer surface of the upper bearing and communicates with the upper flexible structure groove,
2. The hermetic rotary compressor according to claim 1, wherein the lower internal pressure relief means is a lower bearing communication hole that opens to an outer surface of the lower bearing and communicates with the lower flexible structure groove. A plurality of the cylinders, and the plurality of cylinders are stacked via an intermediate partition plate;
The upper bearing and the intermediate partition plate are in close contact with the upper end surface and the lower end surface of the uppermost cylinder of the plurality of cylinders, respectively.
The lower bearing and the intermediate partition plate are in close contact with the lower end surface and the upper end surface of the lowermost cylinder of the plurality of cylinders, respectively. Hermetic rotary compressor.

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